Nanopipette dynamic microscopy unveils nano coffee ring

• 成果类型: Article
• 署名作者: Zhang, Deyi; Shao, Yi; Zhou, Jiayi; Zhan, Qiangwei; Wen, Ziyang; Mao, Sheng; Wei, Jingjing; Qi, Limin; Shao, Yuanhua; Wang, Huan
• 署名单位: Peking University; Peking University; Shandong University
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-10459
• DOI: 10.1073/pnas.2314320121
• 发表日期: 2024-07-09
• 关键词: transmission electron-microscopy; gold nanoparticles; graphene; GROWTH; nanocrystals; water; FLOW; transitions; interface; samples

摘要

Liquid- phase electron microscopy (LP- EM) imaging has revolutionized our understanding sion that requires only standard microscopes. Depending on the imaging condition, the open geometry of the nanopipette allows the imaging of evaporation- induced pattern formation, but it can also function as an ordinary closed- geometry liquid cell where evaporation is negligible despite the nano opening. The nano coffee- ring phenomenon was observed by tracking individual nanoparticles in an evaporating nanodroplet created from a thin liquid film by interfacial instability. Nanoflows drive the assembly and disruption of a ring pattern with the absence of particle-particle correlations. With surface effects, nanoflows override thermal fluctuations at tens of nanometers, in which nanoparticles displayed a drunken man trajectory and performed work at a value much smaller than kBT.